Choose More Settings, click Sent Items and select, Do not save copies of sent items.

Downloading full messages

By default, Outlook downloads just the Sender, Subject, and the Date Information (headers) when syncing email. It downloads the full message only when you click on that email. You can change this behavior by changing the Send/ Receive Settings.

Note:

In Outlook 2013, there are some issues related to Folders sync. We recommend using previous Outlook versions until Outlook 2013 is stabilized for IMAP usage.